Deinking agent for regenerating waste paper and method for deinking waste paper

摘要

A deinking agent for regenerating waste paper is provided, which can efficiently remove ink particles from the pulp fiber and obtain the regenerated pulp having a high brightness degree and a low content of residual ink. The deinking agent for regenerating waste paper comprises an enzyme and a compound represented by the general formula; R.sup.1 O-- (PO)x--[(EO)y--(AO)z]--H (wherein R.sup.1 represents alkyl group or alkenyl group having 8--24 normal or branched chain carbon atoms; PO represents propylene oxide unit; EO represents ethylene oxide unit; AO represents alkylene oxide unit having not less than 3 carbon atoms; x and z represent respectively an integer of not less than 1 and satisfy the following formula, 10x+z100; y is an integer satisfying the following formula, 10y100; PO is added in the form of block configuration; and EO and AO are added in the form of block or random configuration).